92 Ill. Adm. Code 1535.340
Direction of Indication
Section 1535
Section 1535.340 Direction
of Indication
In general and except as
otherwise stated elsewhere, lamp units shall be provided to give an indication
in both directions along the highway. Local conditions, such as one-way
highway traffic, etc., may require a different arrangement. The lamp units shall
be equipped with peepholes in the sides. Hoods should be used on peepholes,
except in special cases where they may interfere with a train crew's
observation of the light emanating therefrom.